Combined electric motor and controller



June 2, 1936. F. J. RATHBUN ET AL COMBINED ELECTRIC MOTOR AND CONTROLLER 1953 3 Sheets-Sheet l Filed July 2l June 2, 1936. F. J; RATHBUN ET A1. 2,042,962

COMEINED ELECTRIC MOTOR AND CONTROLLER Filed July 2l, 1953 3 Sheets-Sheet 2 a orne/1,

June 2, 1936. F. J. RATHBUN ET'AL COMBINED ELECTRIC MOTOR AND CONTROLILIR` 5 Sheets-Sheet 3 m u f 3 u n w www d M@ j @@Mf M7.; I I 0 l j lf. w xm ll. n7 @l U, 6 w ?v\ Q M t O 1|| 5\x IMO I j l 1 M o 9J 6. TTM H lo F M M 2 lo F Patented June 2, 1936 UNITED STATES PATENT OFFICE wa1 1keen,y=\lVis.,lA assignors to The Louis AllisConipany, Milwaukee, Wis., a cerporation" of Wisconsinv Application-July 21,A 1933,A Serial No. 681,450

4 Claims.

The invention relates to a combined electric motor and controller'therefor of theftype in'which the motor and controller are enclosed and combined by a casing intol a-furiitary appliance.

The combined motor and controller which is provided by this inventicnf isdevised primarily for a lathe or other machineit'o'ol on which the piece to be turned or worked is'held or carried by a face plate or other appliance attached to the motor shaft.

The inventionhas as an object to provide a combined motor and controllerVv in which bothVv the motor and controller and the electrical connections between the same are enclosed Within a unitary casing.

Another object istoprovide a combined motor and controllerV with a unitary casing which will facilitate the heat being dissipated fromy theA motor and which Will thereby'increasethefcapacity of a given sized motor.

Another object is to provide' aco'mbined motor and controller with a casing into which the controller may be readily placed and fromv which it may befreadily removed.

Another object is to provide a combined motorr and controller with a unitary controller whichmay be placed within the casingy and removed therefrom as an individual-entity.

Another object is to provide a-c'on'ibinedfmotorl and controller which are'org'anized into asmall and compact unitary appliance.

Another object is to provide aco'mbinedmotor and controller in which the controller and itselectrical connections to theI motor' are readily accessible.

Another object is to provide a combined motor and controller in which the controller has its operating handle arrangedv in anl accessible andconvenient position.

Another object is to provide a motorA with a controller in which' amain switch to starty the motor is' kept from being closed unless the motor brake' is released. Y

Another'object is to provide the motorwitliY a' lock to hold the motor shaft from being turned byv screwing a face plate o r other appliance thereon or unscrewingthe -sarnetherefromi- Another object isltoprolvidethe motor`with a lockl to keep the brake inaposition to-keep an interlocking switch from being closed until the look is released.v

Another object is to provide themotor w' h a lock which iskept from'bei'ng actuated unless the brakeis applied.

According to the vinvention asit is ordinarilyr embodied in practice, the combined electric motor' and controller is provided with a unitary enclosing casing which contains the motor at one end and the controller at the other end and which hasv a lateral entrance theretol having a removablel cover carrying the controller.

The combined motor and controller' shown in the accompanying drawings' and hereinafter described exemplies and embodies the invention` and thevvi'ews in these drawings are as follows:

Fig. 1 is a side View of the combined motor and controller with a; part thereofin section.

Fig. 2 is an end elevation of the controller and the casing.

Fig. 3 is avtransver'se section taken on the line 3 3 of-Fig. 1 with the lbrake released.

Fig. 4 is a View similar to Fig. 3 with the'ibrake applied.

Fig. 5 is a section taken on the line 5-5 of Fig. 4 with the locking bolt in engagement with the brake drum. n

Fig. 6 is a transverse section taken on the line 6-6 of Fig. 1 showing the controller.

Fig. '7 is a detail View of an overload switch. 4

Fig. 8 isa diagrarnof the motor and controller and the electrical circuits thereof.

Motor and controller The motor which is ordinarily employed is of the induction type but any other suitable' motor maybe employed.

The'motor is provided with a stator having' a' laminated core I carrying a winding 2 for conne'ctionto apower circiut and with a rotor having a laminated core 3 carrying conductors connected in a closed circuit. Y

The motorand controller are provided with a unitary enclosing casing 4 which contains the motor in a3v compartment/'5 at one end and the 'Elie controller switches arefca'rried bythe cone" troller-*cov'er 8' and the drumr switch is arranged above the motor shaft, and the main switch and overload switch are arranged below the motor shaft.

The controller has its electrical switches connected to each other and to the motor by electrical conductors arrang-ed within the casing and having sufficient length to allow the controller to be removed from the casing.

The casing has upon each end thereof a removable end plate |4 to permit access to the interior thereof and facilitate assembling and disassembling the motor.

The stator core is supported within its compartment by radial lugs |5 upon the inside of the casing and it is retained in position upon these lugs between expansion rings I6 setting in notches in the lugs.

The rotor core is carried by a shaft |'l extending through each end plate and rotatable in a removable ball bearing |8 carried thereby.

The rotor shaft has a screw-threaded end |9 to attach thereto a face plate 20 or other appliance for carrying or holding the piece to be turned or worked.

The face plate has an aperture 2| in its hub to connect a wrench or other implement thereto to unscrew it from the shaft.

The motor has the heat absorbed from its stator core by the air in the casing circulating through the Ventilating passage between the stator core and the casing, and then the heat is ydissipated from the interior air through th-e casing to external air.

As the air within the casing circulates from end to end thereof and the casing has a large exterior surface to dissipate heat to external air, the stator core has its heat dissipated at a rapid rate and thereby the motor is enabled to operate at a high capacity.

M otor brake The motor is provided with a brake for stopping it upon its circuit being opened by the controller.

The brake has a brake drum 22 xed upon the motor shaft and a brake shoe 23 fixed upon a shaft 24 extending through the end plate and bearing therein.

The brake shoe is actuated to engage it with the brake drum by a handle 25 i'lxed to its shaft on the outside of the casing and bearing against a stop 26 on the end plate in its initial position.

The brake druml is engageable by a sliding locking bolt 2l to keep the motor shaft from being turned by screwing the face plate thereon or unscrewing it therefrom.

The locking bolt is carried by the end plate and retracted from the brake drum by a spring 28 and it engages the brake drum by being pressed into an aperture 29 therein.

The brake shoe has a flange 30 arranged to keep the locking bolt from engaging the brake drum until the brake is applied and having an aperture 3| to allow the locking bolt to pass therethrough into engagement with the brake drum after the brake is applied.

Controller switches The drum switch 9 is provided with rotatable contacts 32 carried by a shaft 33 having one end bearing in the casing cover and the other end bearing in a bracket 34 attached to the casing cover and with stationary contacts 35 arranged to be engaged by the rotatable contacts and carried by an insulating base 36 upon the bracket.

The drum switch is operated by a hand Wheel 3l attached to its shaft and arranged upon the outside of the cover.

The main switch l0 is provided with movable contacts 38 engageable with the stationary contacts and operated by an electromagnet 39.

The starting switch is urged to its open position by a spring and it is actuated by a pushbutton 40 to close it.

The stopping switch |2 is urged to its closed position by a spring and it is actuated by a pushbutton 4| to open it.

The starting switch is connected in circuit to close the main switch to start the motor and the stopping switch is connected in circuit to open the main switch to stop the motor.

The overload switch I3 is of the type disclosed in United States Letters Patent No. 1,894,404, issued to C. W. Kuhn, January 17, 1933.

Such overload switch is provided with two pivoted contacts 43 engageable with stationary contacts and disengageable therefrom by a spring 44.

The pivoted contacts are each carried by an insulating block 45 pivoted upon a heat conducting spindle 46 having a heating coil 4l and carried by a supporting frame 48.

The pivoted contact is retained in engagement with its stationary contact by a latch having a pawl 49 arranged upon the insulating block and engaging a ratchet wheel 59 carried by the spindle.

The ratchet wheel is retained from rotation upon its spindle by being united thereto by a fusible binder.

When the heating coil 4l is subjected to an excessive current, sufficient heat is transmitted therefrom by the heat conducting spindle 46 to fuse the fusible binder. The ratchet wheel 50 is then released to allow the insulating block 45 to be turned by the spring 44 to disengage the movable contacts 43 from their corresponding stationary contacts.

When the excessive current subsides, the fusible binder again becomes solidied to reunite the ratchet wheel to its spindle and retain it from rotation thereon.

The overload switch has its contacts connected in the control circuit of the main switch and its heating coil connected in the motor circuit to respond to an abnormal or excessive current therein.

When the overload switch has responded to open the main switch, it may again be reset by actuating a cam 5| arranged upon a rod carried upon the inner end of the stopping push-but- 'z ton 4|.

When the cam is moved inward by the stopping push-button, it moves each pivoted contact of the overload switch into engagement with its stationary contact and then the pivoted contact is retained in its closed position by its latch.

The controller by which the motor is controlled may be of different types and various switches and appliances may be employed therein.

Controller operation electromagnet 39, conductor 52, overload switch I3, conductor 53, stopping switch I2, conductor 54, interlocking switch 55 on the brake shoe, conductors 5E and 51, interlocking switch 5B on the drum switch, starting switch Il and conductor 59 to the line L2.

The operating electromagnet of the main switch has its circuit maintained by an auxiliary contact 60 on the main switch after the starting switch Il is opened.

The auxiliary contact connects the conductor 56 to the line L2 through conductor 6I, auxiliary Contact Si), and main switch contact 38, instead of through the interlocking switch 58 on the drum controller and the starting switch Il.

The motor circuit is closed by the main switch through conductors 62, E3, and 64, and contacts on the drum switch to the stator winding 2.

After the main switch is closed, the drum switch is operated to connect the terminals of the stator winding to the power line in different relations to thereby increase the speed of the motor.

The overload switch has its heating coils 41 connected in the motor circuit to respond to an abnormal or excessive current therein.

The starting switch is unable to close the main switch to start the motor unless the brake is released to close its interlocking switch 55 and the drum switch is in its initial position to close its interlocking switch 58.

The motor is stopped by opening the stopping switch or by applying the brake and thereby opening the interlocking switch 55.

When the brake is applied or the locking bolt engages the brake drum, the motor cannot be started as the control circuit of the main switch is opened by the interlocking switch 55 on the brake shoe.

The invention which has been set forth and described herein is susceptible of various modifications and embodiments which will be within the scope of the hereinafter claims.

The invention which is set forth in the foregoing description is hereby defined and claimed as follows:

1. A combined motor and controller, comprising a unitary casing provided with a lateral entrance having a removable cover, a motor arranged within said casing and having its shaft bearing in the ends thereof, and a controller provided with a drum starting switch arranged within said casing above said motor shaft and carried by said cover and having its shaft transverse to said motor shaft and with an electromagnetic main switch arranged within said casing below said motor shaft and carried by said cover.

2. A combined motor and controller, comprising a unitary casing provided with a lateral entrance having a removable cover, a motor arranged within said casing and having its shaft bearing in the ends thereof, a controller provided with a drum starting switch arranged within said casing above said motor shaft and carried by said cover and having its shaft transverse to said motor shaft and with an electromagnetic main switch arranged within said casing below said motor shaft .and carried by said cover, and a manual control switch carried by said cover and controlling said electromagnetic main switch and operatable from the outside of said cover.

3. A combined motor and controller, comprising a unitary casing forming a motor compartment at-one end and a controller compartment at the other end in open communication with each other to allow free circulation of air between the same and having a lateral entrance to said controller compartment, a removable cover closing said entrance and attached to said casing, a motor arranged witliin said motor compartment and provided with a stator core carried by lugs upon the inside of said casing and spaced from said casing to provide an air passage over said core and with a rotor core carried by a shaft bearing in the ends of said casing, and a controller carried by said cover and arranged within said controller compartment.

4. A combined motor and controller, comprising a unitary casing forming a motor compartment at one end and a controller compartment at the other end in open communication with each other to allow free circulation of air between the same and having a lateral entrance to said controller compartment, a removable cover closing said entrance and attached to said casing, a motor arranged within said motor compartment and provided with a stator core carried by lugs upon the inside of said casing and spaced from said casing to provide an air passage over said core and with a i rotor core carried by a shaft bearing in the ends of said casing, and a controller provided with a drum starting switch arranged within said casing and carried by said cover and having its shaft transverse to said motor shaft.

FRANK J. RATHBUN.

RALPH J. OWEN. 

